Cutter-head.



No. 843,498. PATENTED FEB. 5, 1907.

E. s. SHIMER.

CUTTER HEAD.

. APPLICATION FILED SEPT. 11,1906.

'2 SHEETS-SHEET 1.

I H ,0 glvwentoz: [M er fl /zhnfr, W m an 47 No. 843,498. PATENTED FEB.5, 1907.

E. S. SHIMER.

CUTTER HEAD.

APPLIGATION FILED SEPT..11, 1906.

2 SHEETS-SHEET 2.

UNITED STATES PATENT FFICE.

ELMER S. SHIMER, OF MILTON, PENNSYLVANIA, ASSIGNOR TO SAMUEL J. SHIMERAND SONS, INCORPORATED, OF MILTON, PENNSYLVANIA.

CUTTER-HEAD.

Specification of Letters Patent.

Patented Feb. 5, 1907.

Application filed September 11, 1906. Serial No. 334,097.

T0 at whowt it may concern.-

- Be it known that I, ELMER S. SHIMER, a citizen of the United States,residing at Milton, in the county of N orthumberland and State ofPennsylvania, have invented certain new and useful Improvements inCutter- Heads, of which the following is a specifica tion.

This invention relates to cutter-heads for woodworking-machines, and ithas particular reference to that type of cutter-heads manufactured bySamuel J. Shimer and Sons, of Milton, Pennsylvania, which are known tothe trade as wing-mortised heads.

Cutter-heads of this type consist of a central hub havingradially-extending wings that are provided with transverse mortises forthe reception of the knives or cutters which have heretofore beensecured in tlte mortises by means of set-screws inserted through theupper ends of the wings and bearing against the upper edges of thecutters, the latter being thus forced downward into the lower ends ofthe mortises, where they are securely bound by tightening theset-screws.

Further distinguishing characteristics of the particular cutter-heads towhich the present invention or improvement is particularly applicableare that the cutting edges of the blades or cutters, which projectradially beyond the circumference of the cutter-head, are disposedparallel with and in the vertical plane of the axis of rotation of thecutterhead, each blade being confined between solid metallic portionsforming the top and bottom of the cutter-head, and not merely seated ina groove formed in the latter, as is sometimes the case in other makesof cutterheads. It is desirable that the cutters be disposed as close aspossible to the lower end of the cutter-head, and for this reason thethickness of the metal between the lower ends of the mortises and thebottom of the cutterhead is limited. No reason exists, however, why thethickness of the metal between the upper ends of the mortises and thetop of cutter-head should not be as great as may be desired.

It has been found in practice that the downward stress or strainexercised by the set-screws upon the cutters and through the latter uponthe material at the lower ends of the mortises, plus the Working strainto which the cutters are exposed is sometimes so great as to cause thecomparatively thin material between the lower ends of the mortises andthe bottom of the cutter-head to be ruptured, thus releasing thecutters, thereby sometimes seriously injuring the machinery andendangering the attendants or operators. Again, it has been customary tomake the setscrews of a diameter not exceeding the thickness of thecutters or the width of the mortises, and this being usually onlythreeeighths or, at most, seven-sixteenths of an inch gives noopportunity for securing a strong grip or hold, it being found that thethreads are frequently twisted off the screws in tightening the latter.

The object of the present invention is to overcome these disadvantagesby providing means for securing the cutters without forcing themdownward against the comparatively weak portion of the cutter-head, andalso to provide for the use of holding screws or bolts of amplediameter, so that the parts may be securely tightened together withoutdanger of stripping the threads from the screws or bolts.

With these and other ends in view, which will readily appear as thenature of the invention is better understood, the same con sists in theimproved construction and novel arrangement and combination of parts,which will be hereinafter fully described, and particularly pointed outin the claims.

In the accompanying drawings has been illustrated. a simple andpreferred form of the invention, it being, however, understood that nolimitation is necessarily made to the precise structural details thereinexhibited, but that changes, alterations, and modifications within thescope of the invention may be reserted to when desired.

' In the drawings, Figure 1 is a side elevation of a cutter-headembodying the invention. Fig. 2 is a horizontal sectional view of thesame, taken on the plane indicated by the line 2 2 in Fig. 1. Fig. 3 isa vertical sectional view taken on the plane incicated by the line 3 3in Fig. 2. Fig. 4 is a vertical sectional view taken on the planeindicated by the line 4 4 in Fig. 3. Figs. 5 and 6 are horizontalsectional views taken on the planes indicated by the lines 5 5 and 6 6,respectively, in Fig. 1. Fig. 7 is a perspective detail view of one ofthe cutter-securing slotted bolts detached from the cutter-head, thecutter being outlined in dotted lines. Fig. 8 is a vertical sectionaldetail view taken through one of the wings of the cutter-head andillustrating the use of a filler in connection with the slotted bolt anda cutter of less than the regular width. Fig. 9 is a vertical sectionalview through one of the wings, illustrating a modifioation.

Corresponding parts in the several figures are denoted by likecharacters of reference.

The cutter-head comprises a sleeve or hub 1, adapted to be mounted inthe usual man ner upon a spindle or arbor, (not shown,) said. hub beingprovided with a set-screw 2, whereby it may be secured upon the spindle,and said hub being also equipped with. the usual adjusting-screw 3,having a j am-nut 4.

The hub is provided with. radially-extending wings 5 5, wherein areformed the mortises 6 for the reception of the knives or cutters 7, itbeing observed that said mortises are formed transversely intermediatethe up per and lower ends of the heads and relatively near the lowerends of the wings, the thickness of the material between the upper endsof the mortises and the top of the cutter-head being considerably inexcess of the thickness of the material between the lower ends of themortises and the bottom of the cutter-head. ln fact, the material at theup per ends of the mortises may be reinforced to any desired extent.

The mortises 6 are intersected by bores 8 of a diameter considerablyexceeding the width of the mortises, said bores extending verticallythrough the wings of the cutterhead. These bores are for the receptionof the cutter-securing bolts or members H, each of which comprises abody 9, preferably of cylindrical shape, to fit the bore or aperture 8,and having at its upper end a screw-threaded. shank 10, which, as shown, may be of a diameter somewhat less than that of the body 9,although this is not necessary or essential. The body 9 is provided witha slot 1.1, adapted to register with the mortise in the wing wherein thecutter-holder is placed, the cut- 'ter 7 passing through the mortise 6and through the slot 11 in the body 9 of the holding member. Thethreaded shank 10 of the latter is provided with a nut 12, which may betightened against the top of the cutter head.

It will be apparent from the foregoing description that when the partsare assembled. and the nuts 12 are tightened the holding members H willbe drawn upward, thus drawing the cutters into binding engagement withthe reinforced upper portion of the cutterhe ad, where said cutters willbe held with great security, the relatively thin and weak lower portionof the cutter-head being relieved from all strain except the ordinaryworking strain. The cutters will thus be held by drawing them intointimate relation with the material of the cutter-head, and thewedgingapart or pressing-apart action caused by the holding meanscustomarily employed is totally avoided.

A decided advantage of the present invention resides in the facilitywith which the cutters may be released and exchanged when desired, andanother important advantage lies in the fact that the threaded shanks ofthe holding members may be made of a size to insure great strength andlittle liability of stripping or injuring the threads when the nuts aretightened to suchan extent as to assemble the parts with absolutesecurity.

The improved holding device does not preclude the use of blanks orfillers when knives or cutters of less than regular width are to beused, as will be understood by reference to Fig. 8 of the drawings,where a blank or filler has been shown at 15, said filler being placedadjacent to the lower edge of the cutter.

While the bores 8 for the reception of the holding members arepreferably and usually made of one diameter throughout, the upper endsof said bores, extending through the top of the cutter-head, may bereduced, as will be seen at 16 in Fig. 9 of the drawings, saidmodification being obviously within the scope of the invention. I

From the foregoing description, taken in connection with the drawingshereto annexed, the operation and advantages of the invention will bereadily understood by those skilled in the art to which it appertains.

The construction is simple and thoroughly efficient for the purposes forwhich it is devised.

Having thus described the invention, what is claimed. is

1. A radial-arm cutter-head having wings provided. withv mortises andvertical bores intersecting the mortises and of a diameter ex ceedingthe width of the mortises, movable members seated in the bores above andbelow the mortises and having slots registering with the mortises,cutters extending through the slots and mortises, and nuts threaded uponthe upperends of the movable members and bearing upon the cutter-head.

2. A radial-arm cutter-head having wings provided with mortises disposedrelatively near the lower end of the cutter-head, the material of thelatter being of greater thickness above than below the mortises, saidwings being also provided with vertical bores intersecting the mortises,movable members seated in the bores above and below the mortises andhaving slots registering With the mor- I name to this specification inthe presence of tises, cutters extending through the slots and twosubscribing Witnesses.

mortises, and nuts t readed upon the u er ends of the movable membersand beaiiihg ELMER SHIMER' against the relatively thick or reinforcedportion of the cuttenhead above the mortises.

In testimony whereof I have signed my I Witnesses:

FRANK LONGMORE, WM. P. WENDLE.

